Gravity concrete-mixer.



G. W. MILLS & J. E. SIMPSON. GRAVITY CONCRETE MIXER. APPLICATION FILED NOV.15. 1912 p 1,072,143. Patented Sept. 2, 1913.

2 SHEETS-SHBBT 1.

0. MM M W0 A TTORNE Y 8 G. W. MILLS & J. E. SIMPSON. GRAVITY CONCRETE MIXER.

APPLICATION FILED NOV.15. 1912.

1,072,13. Patented Sept. 2,1913.

2 SHEETS-SHEET 2.

WITNESSES INVENTORJ l By MM 4 6;

a. ATTORNEYS 4 option.

cannon w. MILLS AND JAMES E. snarson, or enoaenrowmrnnnsrnvanm.

eaavrrr concanrn-mrxnn.

Specification of Letters Yatcnt.

Patented Sept. 2, 1913.

To all whom it may concern:

Be it known that we, GEORGE W. MIL and JAMES E. SIMPSON, citizens of the United States, and residents of Georgetown, in the county of Beaver and State of Pennsylvania, have invented a new and useful Improvement in Gravity Concrete-Mixers,

of which the following is a specification.

Our invention is an improvement in ravity concrete mixers, and has for its 0 ject the provision of mechanism of the character specified, by means of which the elements necessary for the formation of concrete may be intimately combined in proper proportions by the mere act of passing the materials through the device by gravity.

In the drawings z-Figure 1 is a transverse vertical section of the improvement, Figs. 2 and 3 are sections on the lines 2-2 and 3-3 respectively of Fig. 1, Fig. 4 is a plan view of one of the mixing dev ces, and

Fig. 5 isa side view of the mixing device partly in section.

The present embodiment of the invention comprises a plurality of superposed hoppers, the upper hopper 1 having its outlet 2 above and in line with the outlet 3 of the lower hopper 4.. A suitable framework 5 is provided for supporting the hoppers, and a platform 6 is arranged on the top of the framework. An opening 7 is provided in the platform, and brackets 8 are arranged at the opening. for engagement by the hopper. The outlet 2 of the hopper is below the platform, and the lower hopper 4: is sup ported by brackets 9, similar to the brackets 8, the said brackets 9 being arranged on material to be fed into the hopper, each of the said plates bei cross bars It) of the framework. The top of the upper hopper is directly below an opening 11 in a suitable container 12 for the raw material, the opening 11 permitting the upper hopper which is a receiver for the ifi'erent elements of the combination.

A framework consisting of crossed pairs of plates 13 and 14is arranged in the upper approximately triangular in shape an ranged with its base upward. The bases of the plates are in the same plane, and the arrangement of the plates provide for nine sub-divisions or compartments in the framework. The arms 15 of a yoke are secured to the framework at the central compartment 16, and' the bodyl l'l of the .oke has connected therewith one end of :1. ever 18,

.13-14 as before stated,

27, whose upper end is pivoted at 28 to the receptacle, before mentioned. The rod 22 1s slidable through the block 23, and downward'movemont of the rod is limited by a p1n29, passing through the upper end of the rod above the block.

The outlet 2 of the upper hopper is provided with oppositely arranged lugs 30, and a rod 31 depends from each of the said lu s. AJHIXOI' or baffle plate 32' is. supported By the rods 31, the said mixer or ballle plate being of frusto-conical form, and'hollow as shown. The said mixer or battle plate is in fact a hollow cone having its apex cut away and provided with bearings 33 at opposite sides, through which are passed the lower endsof the rods 31 and cotter ins 34 or the l ke are passed through the ower ends of the rods to support the device.

A conical gate 35 is secured to the lower end of the rod 22, the said gate fitting with- 1n the mixer or baflle late and closing the upper end thereof as s IOWII in dotted lines in F1g. 1. When the rod 22 is lifted by swlnging the lever 25, the gate 35 is first lifted to close the opening 36 at the top of the mixer or baflle plate, and a further movement of the rod lifts both gate and mixer into the dotted line position of Fig. 1, thus closing the outlet of the u per ho per. The framework 1314= may he lifte by means of the lever 18, and normall the said framework .occupies the position s own in Fig. 1.

In the operation of the construction descrlbed the hop er 1 with its outlet closed is first rovide -with a layer 37 of gravel, the said layer being arranged on the inner surface of the hopper of the required depth, and the framework 13--14 is placed as shown in the said Fig. 1. The framework rovides for nine compartments, the centre compartment 16 being left empty to permit the free movement of the rod 22.

The compartments in the hopper,

line with the central compartment, four in number, are adapted to receive. sand, while the diagonal compartments are adapted to receive cement. When the hopper has been loaded as above specified, with the layer of gravel at the outside and the sand and cement in the compartments of the framework, the framework may be lifted by means of the levers 18, thus leaving all of the ingredients in the position shown, but in contact with each other instead of being separated by the partitions or plates 13-14.

The outlet 3 of the lower hopper is normally closed by a door or gate 38, pivoted to a threaded lug 39 extending downwardly from a bearing ring 40, encircling the outlet, the gate having a bearing boss 41 for engaging the lug. A nut 42 holds the gate on the lug and a cotter pin or the like may be passed hrough the lug to lock the nut in place. A h: ndle 43 is provided for manipulating the gate, and the said gate at the opposite end from the handle rests upon a holdinglug 44, connected with the bearing ring.

A mixer or baffle plate 45 of frusto-conical form is supported coaxially with the hopper 4, by means of bracket arms 46, extending outwardly from the top 'of the baflle plate and connected to the inner face of the hopper. The open lower end 47 of the baflie plate is in alinement with the outlet 3 of and the top opening of the baflle plate is below the outlet of the upper hopper. are arranged at the upper end of the baffle plate in spaced relation on the inner face thereof, each plate having one "of its edges turned over as shown at, 49. The arrangement is such that when thematerial falling from the outlet strikes the said plates, the

' said. material will mount the turned over edge 49 of the plates, and a portion thereof will be thrown on top of the remaining por-.

tion. The said plates will in effect turn over and thoroughly mix the material. Similar plates 50 are arranged on the outer surface of the mixer 32 near the lower edge thereof, each plate having on of its edges turned over as shown in Figfl in the same manner as the plates 48. .j

The mixers or baflies 32 and 45 are of substantially the same construction and operate in the same manner, the said plates being however, oppositely arranged; The upper baflie plate or mixer 32 is arranged with its small end upward to deflect a portion of the material outward, whilethe bafile plate or mixer 45 is arranged with its large end'upward to deflect a portion of the material inward. The operation is the same, and they are arranged as specified in order to thoroughly 111121 the material.

In operation, after the raw -materials,

have been arranged in the upper'hopper as A plurality of deflecting plates 48.

not interfere with emma specified, the lever 25 is operated to place the cone 32 and the gate 35 in the position shown in full lines in Fig. 1. The materials in the upper hopper will now rush out through the outlet, a portion striking the upper surface of the cone, while another portion will pass through the opening 36 at the top of the cone and will strike the outer surface of the gate. That portion of the material that strikes the outer surface there-- of will be thrown outwardly, and as it passes down it will strike the plates 50 and the turned over edges 51 thereof, and will be thoroughly mixed as it leaves the cone. This portion will then strike the baffle plate 45 at the upper edge thereof, and will be again turned over and intimately mixed by the deflecting plates 48. A portion of the material will be thrown outside the bafile plate, striking the inner surface of the hopper 4 and another portion will pass down through inside the mixing device, so that all the materials will be very intimately and thoroughly mixed before passing out at the outlet 3 of the lower hopper. The deflected plates 48 and 50 will impart a whirling or eddying movement to the materials, and when the materials finally settle in the hopper 4, they will have been thoroughly mixed and in condition for use.

In Fig. 1' mechanism is shown for spray ing water on to the materials after they are I mixed. The said mechanism is so arranged that every portion of the material is subjected to the actionof the spray. A water pipe 52 is lead from a suitable source of supply to a point above the hopper, and a valve 53 is inter osed in the said pipe adjacent to the position occupied by the operator when operating the dev1ce. A vertical section of pipe 54 is connected with the inner end of the pipe 52, and the said vertical section passes through a bearing 55 on one of the arms 15 of the yoke, the said section being slidable through the hearing. A ring 56 is arranged at the lower end of the pipe 54, the said ring having a; plurality of series of openings in its bottom for throwing the water inwardly and outwardly, to

thoroughly spray all of the material as it passes through the outlet. The pipe does the movement of the framework. I 4

' We claim 1. In a gravity concrete mixer, a mixing 12o device comprlsfiig a frusto conical member having a plurali of mixing plates near its large end, each 0 the saidplates having one of its ed es turned over on the; late in spaced re ation, said plates being similarly arranged and in spaced relation, and means for feeding the material to be mixed axially of the frusto conical member.

2.1m a-gravity concrete mixer, a mixing 5 device comprising a h'usto conical member 13c having a plurality of mixing plates near its large end, each of the said plates having one of Its edges turned over on the plate in spaced relation, and means for feedmg the material axially of the frusto conical member.

3. In a gravity concrete mixer, a mixing device comprising a frusto conical member having a plurality of mixin plates near its large end, each of the sai plates having one of its edges turned over on the plate in spaced relation.

4. In a gravity concrete mixer, a batlle plate provided with a plurality of mixing plates, each plate having one of its edges turned over upon the plate in'spaced relation.

5. In a gravity concrete mixer, -a hopper provided at its outlet with o positely arran ed depending rods, a rusto-conical ba e plate mounted to slide on the rods and arranged with its small end upward, means within the baflle plate for raising and lowering said plate to open or close the outlet of the hopper, and a lurality of mixing devices arranged around the upper edge of the baffle plate, each plate having one of its edges .bent over upon the edge of the plate in spaced relation.

6. In a gravity concrete mixer, a plurality of oppositely arranged frusto-conical baffle plates, each having a lurality of mixing plates near one edge, eac of the said mixing plates havin one of its edges turned over upon the ba e plate in spaced relation, the mixing plates on each bafile plate being similarly arranged.

7. In a gravity concrete mixer, a plurality of oppositely arranged frusto-conical bafile plates, each having a plurality of mixing plates near one edge, each of the said mix- {111g plates havin one of its edges turned over upon the ba e plate in spaced relation.

GEORGE W. MILLS. JAMES E. SIMPSON. Witnesses:

W. 0. RICE, W. C. KANE. 

